I'm trying to track down a research paper that I have lost the details for. Any help tracking it down would be very, very welcome!
It described an experiment where a US college showed prospective students a promotional video with one of two narration tracks: one which said that all students are welcome; and another where various minority groups were specifically said to be welcome. I seem to recall that the video itself, which showed a variety of students, was the same for both groups.
The results showed that students from those minority groups rated the video that singled out demographic groups as less welcoming.
The conclusion was that by singling out demographics as needing to be welcomed separately, this made people feel different and therefore less welcome.